/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.table.runtime.operators.wmassigners;

import org.apache.flink.streaming.api.operators.AbstractStreamOperatorFactory;
import org.apache.flink.streaming.api.operators.OneInputStreamOperatorFactory;
import org.apache.flink.streaming.api.operators.StreamOperator;
import org.apache.flink.streaming.api.operators.StreamOperatorParameters;
import org.apache.flink.table.data.RowData;
import org.apache.flink.table.runtime.generated.GeneratedWatermarkGenerator;
import org.apache.flink.table.runtime.generated.WatermarkGenerator;

/**
 * The factory of {@link WatermarkAssignerOperator}.
 */
public class WatermarkAssignerOperatorFactory extends AbstractStreamOperatorFactory<RowData>
	implements OneInputStreamOperatorFactory<RowData, RowData> {

	private static final long serialVersionUID = 1L;

	private final int rowtimeFieldIndex;

	private final long idleTimeout;

	private final GeneratedWatermarkGenerator generatedWatermarkGenerator;

	public WatermarkAssignerOperatorFactory(
			int rowtimeFieldIndex,
			long idleTimeout,
			GeneratedWatermarkGenerator generatedWatermarkGenerator) {
		this.rowtimeFieldIndex = rowtimeFieldIndex;
		this.idleTimeout = idleTimeout;
		this.generatedWatermarkGenerator = generatedWatermarkGenerator;
	}

	@SuppressWarnings("unchecked")
	@Override
	public StreamOperator createStreamOperator(StreamOperatorParameters initializer) {
		WatermarkGenerator watermarkGenerator = generatedWatermarkGenerator.newInstance(
			initializer.getContainingTask().getUserCodeClassLoader());
		WatermarkAssignerOperator operator = new WatermarkAssignerOperator(
			rowtimeFieldIndex,
			watermarkGenerator,
			idleTimeout,
			processingTimeService);
		operator.setup(
			initializer.getContainingTask(),
			initializer.getStreamConfig(),
			initializer.getOutput());
		return operator;
	}

	@Override
	public Class<? extends StreamOperator> getStreamOperatorClass(ClassLoader classLoader) {
		return WatermarkAssignerOperator.class;
	}
}
